SmartArray 642 connecting two Drive Cages

Hello,

We have a ProLiant ML350 G4p with an SmartArray 642 Controller. At the Moment,the original 6 Bay Drive Cage is connected to the 642 Controller with a RAID5 Configuration. We want to install the additional 2Bay Drive Cage. The Question is, if we can connect the 2Bay Cage also on the Controller to build a RAID5 with 8 HDD´s.